Never tried Gunbutter, although the name is hilarious for some reason. I started using Shooter's Choice FP10, and really like it. And I like Rem-Oil on exteriors and inside the barrel between sessions. Plus I'll use Tetra bore conditioner every once and a while, just for kicks. I was advised to heat the barrel with a hair dryer and apply Tetra, to improve accuracy. Of course when I eventually buy Don's guide rod, I will also check out some EEZOX. That stuff sounds like the real deal.